Yeah sure , there are tons of games like that. Here are my favourites and others.
>www.runescape.com
>Guild wars (requires CD you can buy online)
>MechQuest
>Dragonfable
>AdventureQuest
>2moons (downloadable from www.2moons.com)
>www.ebilgames.com
>www.miniclip.com (has over 200+ games)
>www.addictinggames.com (same like miniclip but here you'll find more games like you'd wanted).
>www.freeonlinegames.com.

*phew* hope this helps